77878241 has 8 divisors (see below), whose sum is σ = 94239360. Its totient is φ = 62826048.

The previous prime is 77878223. The next prime is 77878243. The reversal of 77878241 is 14287877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77878241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77878192 and 77878201.

It is not an unprimeable number, because it can be changed into a prime (77878243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327101 + ... + 327338.

It is an arithmetic number, because the mean of its divisors is an integer number (11779920).

Almost surely, 2^77878241 is an apocalyptic number.

It is an amenable number.

77878241 is a deficient number, since it is larger than the sum of its proper divisors (16361119).

77878241 is a wasteful number, since it uses less digits than its factorization.

77878241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654463.

The product of its digits is 175616, while the sum is 44.

The square root of 77878241 is about 8824.8649281448. The cubic root of 77878241 is about 427.0434298873.

The spelling of 77878241 in words is "seventy-seven million, eight hundred seventy-eight thousand, two hundred forty-one".